4s in a TC3
 

I'm looking for a good motor to run in a tc3 on 4s. Anybody here run a tc3 on 4s? what gearing works for you? Right now my tc3 has a mm w/7700 on 2s. Its alomst fast enough now :lol: Any outrunner suggestions?

i ran my tc3 on 4s 2 weeks ago. used a e savage esc and a silver can motor. and boy it was pretty fast with a 28t on it :P

didnt get too hot either... but HUGE arcing from the brushes :)

good luck, with any luck you dont ruin your drive shafts like i did. getting a custom fibre one made for $40 from the states as we speak... the alloy ones just warp at full speed (reedy 3 star 4300kv on 4s) and got 1 speed pass... went to rev it to see if it was still good and it buckeled... then i took the shaft out put 2s in it and plugged it into the mamba max... and it went poof?? wtf?? o well, off for repairs... just really weird.

I've got a 37-48 outrunner that's been ran 2 times. It's about 1000-1100kv, and would be a good 4 or 5s motor. let me know if interested.

I ran my TC3T with 4S lipos using the HV4.5 Novak motor. Lots of fun trying to keep it going straight with pizza cutters like tire action :lol:.

i think thats a little overkill on the motor:lol: to much extra weight

Had to try it. It was a nice experience :lol:.

:lol:

I use a mamba 4600 system on 4s in my TC3. I run 35mm foam tires, an IRS driveshaft and rear spool, and a proline lola gas body w/ a lexan splitter/ undertray/ diffuser.

We run the TC4 on 4S at over 100 with a MM5700 setup. The car WILL handle it!!

thats what i love about tc3's. as long as you can steer it, it can handle it...

ive got a shaft coming which should be here next week, i will post a picture of it when i get it. cost $42us shipped international.

will the 5700 handle 4s reliably, or will it grenade? thanks

The stock plastic diff outdrives and stock aluminum driveshaft cant handle much, but those are easy fixes.

Neither, the magnet wont seperate, but itll run too hot for the magnet to hold its strength for long. Its doable for short runs.

Too hot in what sense?? When you set up a car for 100mph speeds, you are not going to have a car that will play for 10 minutes straight! We get about 10-15 passes of about 600 feet with the setup before it hits about 170-180 on the motor and 150-170 on the ESC, We then let it cool down for about 30 minutes before running them again. This setup also consists of no extra cooling added!!

Ive killed 2 stock center driveshafts w/ my 4s tc3. They flex in teh middle then centrifugal force flings them out, shattering receiver cases on the way.

I tried a 5700 on 4s with similar results to what you described. If thats what you call reliable, then sure its reliable. IMO if it cant survive a full battery it isnt reliable. My 4600 can run for a whole battery while geared for over 100 without heat issues. Ive only managed to do that a couple times because crashes at those speeds are pretty spectacular (and expensive). Thats with no fans or extra heatsinks, I guess the airflow is pretty good at those speeds.

those shafts are the only weak bit.. i wonder if you could convert it to pulley drive?

I have the carbon fiber drive shaft in my TC3s and they are great. I can still beat the crap out of the new TC in the market.

I find it surprising that the the Tekin redline motors are often overlooked. I'm in the midsts of testing my tekin 632 3200kv motor on 4s with the MM in a xxx4. The design of the tekin motors is very similar to that of the Castle motors (rotor size, coreless design, can dimensions) but unlike the castle motors, they are rebuildable and have solder tabs.

So far i've tried 19 and 23 tooth pinion gears, which translate into theoretical speeds of 46 and 54 mph. The battery I am using is a Neuenergy 4s 4100 mah 30C pack - the same battery that I use in my 8ight conversion, in other words, overkill. RTR weight is just under 4 lbs.

With the 19 tooth after 5 minutes of running up and down the street:

Motor: 180F
ESC: 125
Battery: 85

It felt as if the motor topped out very quickly. Motor temps were very surprising high.

With a 23 tooth pinion gear after 5 min;
Motor: 185F
Esc: 130
Battery: 90

Again motor temps were very high. Top end did not seem that much greater, but it was hard to tell since the motor doesn't make any revving sound, and neither does the xxx4 belt.

I'm going to try a 17 tooth pinion gear before increasing the timing from 0 degrees to 10 degrees to see if that improves motor temps. I'm guessing the tekin motors are 4 pole motors since 6 turns seems a bit low for 3200 kv don't you think?

I did speed runs, but not 5 minutes worth. I changed the Trinity N80 in favor of a Novak 5.5R using a 35T pinion and 72T spur. I will also try a 69T spur later. I'm only using 2S lipos and I've been able to reach 50mph+ with the N80, 32T pinion and 72T spur. I have 2 new ESC and a 5.5 motor to try out. Both of this units can be run in sensored or sensoless mode. The Hobbywing ESC can handle 4S lipos, but will the 5.5R motor handles the high RPMs? The rotor is wrapped with Kevlar.

Update: I just got done running the 632 with a 17 tooth pinion. Still 180 on the motor after 5 minutes, esc 140, battery 95. Ambient temperature was 90F vs. 75F during the first two runs. Then I increased the timing to 10 degrees, 175 on the motor, and the same esc and battery temps. Now I know for certain this is not a gearing or a timing issue. I'll ask around the tekin forums on the tekin website i guess.

If the Tekin motor doesn't work out, my other choice for a 4s motor and 50 mph speeds or 2s 7700 equivalent would be a novak style motor of 8.5 to 10.5 turns. My novak hv4.5 is the most efficient motor I've tried. During these summer days, it still reaches about 180 degrees, but thats after a full 12 minute run, pulling a buggy that is twice as heavy geared to go 50.

Those temps are high. I ran my N80 which has a Kv of 7800 with the 35T/72T combo with no heat issue at all. Ambient temps here is also around 90.

I just got one of these. looks good in person. I'll see how it works out.
ez run 4300kv